Microsoft shows off its operating system makeover, along with a number of other surprises. Live updates from ABC News and our partners at Yahoo Tech

We're 15 minutes away before the start of Microsoft's big event. We'll be live blogging the latest on Windows 10 and any other surprises Microsoft has in store, along with our partners at Yahoo , so stay with us.

by Alyssa Newcomb1/21/2015 4:48:33 PM

Quick update before this event officially gets going. I (Rafe) am at Microsoft at the event and will cover what I can see from here. Other team members will be providing additional analysis and commentary, and helping manage the community (that would be y'all) for questions and comments.

Join us right here on January 21 at 9:00 a.m. Pacific Standard Time to learn about the next chapter for #Windows10.

by Rafe Needleman/ Yahoo Tech...via Yahoo! USA1/21/2015 4:54:18 PM

Why Windows 10? Shouldn't there be a Windows 9?

Microsoft has a reason for skipping over No. 9. "Windows 10 carries Windows forward into a new way of doing things. It is not an incremental change, but a new Windows that will empower the next billion users," a company spokesperson told ABC News.

by Alyssa Newcomb1/21/2015 4:57:38 PM

This keynote is going to be two hours. Then a break, then demos.

by Rafe Needleman/ Yahoo Tech...via Yahoo! USA1/21/2015 5:01:09 PM

Terry Myerson, EVP of Operating Systems is now on stage kicking off the event. We got a sneak peek at Windows 10 last year but there's plenty more to learn today about new experiences.

Windows 10 has been installed more than 3 million times by Microsoft insiders who have tested it and have shared more than 800,000 pieces of feedback.

At least 1.5 billion people in the world use windows, according to Microsoft.

by Alyssa Newcomb1/21/2015 5:06:53 PM

Windows consumer beta tester stats.

by Rafe Needleman/ Yahoo Tech...via Yahoo! USA1/21/2015 5:06:57 PM

Myerson outlines three key points:

Mobility of experience. You should be able to use the technology on whatever device you want.

The second area Microsoft has worked on innovating is trust. "You are our customer, not our product."

Lastly, natural interaction such as voice and gesture control can be integrated.

by Alyssa Newcomb1/21/2015 5:12:04 PM

The Windows 10 event is supposed to last two hours. Here's to hoping that former Microsoft CEO Steve Ballmer stops by for a dance break. Check out his amazing moves here.

by Alyssa Newcomb1/21/2015 5:16:00 PM

Terry: The question, "What version are you running?" becomes not a thing. Windows is a service. Users will always be up to date

by Rafe Needleman/ Yahoo Tech...via Yahoo! USA1/21/2015 5:17:49 PM

Windows 10 is a free upgrade for all Windows 7 and 8 users for the first year.

by Alyssa Newcomb1/21/2015 5:18:55 PM

"Today really is a monumental day for Windows," Myerson said. "Windows 10 is so much more than the latest version of Windows."

by Alyssa Newcomb1/21/2015 5:21:18 PM

If you're having problems with the Microsoft live stream, you're not the only one. Many people are reporting on Twitter that coverage has been a been spotty. Stay with us for updates so you don't miss any of the big announcements.

by Alyssa Newcomb1/21/2015 5:23:35 PM

Alex Kipman just announced "Windows Holographic," which blends your digital world and your real world. We're about to find out more about what that means.

Imagine an engineer seeing instructions as they work, a surgeon learning a procedure virtually, turn your living room into a "surreal" gaming environment. "Holograms can become part of our everyday life."

by Alyssa Newcomb1/21/2015 6:46:13 PM

I suppose this means with "Windows Holographic" you might be able to get personal concert experiences from some of your favorite performers. Hologram Michael Jackson, anyone?